I have never seen anything like that.
I guess if it is that important to you, you could always remove the original stud and replace it with a stainless 10-32 or 8-32 stud.
However, I am not too familiar with Track's hardware, but the Treso jags have the studs installed pretty tight using a special machine, at least that is what Don has alluded to. I am going to go visit them in a couple of weeks, i will be sure to ask about that.
Seems like more trouble than it is worth.
I have been shooting these silly guns for a lot of years and never had any problem with rust issues on the jag studs. I guess if every now and again you were to give it a bit of Bore Butter or whatever, it would keep the threads lubricated well enough.
Actually, if one keeps the jag tight on the rod, the brass threads won't give you any trouble, either. It is people who let the jag get loose that have the trouble with them breaking off.
All this is FWIW and YMMV and all that stuff. There is no warranty, either expressed or implied. Hah!!
John